Features 1、Made of premium high speed steel,with high hardness, durable in use 2、With a plastic case , easy to store & carry. 3、Sharp drill blade, ensures small drilling resistance, chip smoothly,high efficiency 4、Universal round and straight shank design, convenient for electric drill 5、The specification vary from 1mm to 10mm, to meet all kinds of demands; Specification Features: Made of premium high speed steel,with high hardness, durable in use With a plastic case , easy to store & carry. Sharp drill blade, ensures small drilling resistance, chip smoothly,high efficiency Universal round and straight shank design, convenient for electric drill The specification vary from 1mm to 10mm, to meet all kinds of demands; Specification: Material: high speed steel Shank: straight shank Product size: 1-10mm Package list: 19 x Twist Drill Bit Package List